Bicycle frame



FIG. 1 is a perspective view of a bicycle frame showing my new design;

FIG. 2 is a top view of the bicycle frame of FIG. 1;

FIG. 3 is a bottom view of the bicycle frame of FIG. 1;

FIG. 4 is a left side view of the bicycle frame of FIG. 1;

FIG. 5 is a right side view of the bicycle frame of FIG. 1;

FIG. 6 is a front view of the bicycle frame of FIG. 1; and,

FIG. 7 is a rear view of the bicycle frame of FIG. 1. 

The ornamental design for a bicycle frame, as shown and described. 